void added inline comments.
================
Comment at: clang/lib/Sema/SemaInit.cpp:2171
if (Field == FieldEnd) {
// We've run out of fields. We're done.
----------------
stuij wrote:
> @void Unfortunately this end of fields check will break the non-designated
> initializer check below.
>
> I GDB'ed through a failure of the below test, and if I'm understanding this
> correctly, the `CheckDesignatedInitializer` invocation above will move
> `Field` to the next available field in the struct. If there is none, we will
> break out of the loop and never reach the code below (On an AArch64 Linux
> host the field was placed last in the struct).
>
> Instead I get a different error:
>
> error: 'error' diagnostics expected but not seen:
> File
> /Users/zeno/code/llvm/clean/clang/test/Sema/init-randomized-struct.c Line 46:
> a randomized struct can only be initialized with a designated initializer
> error: 'error' diagnostics seen but not expected:
> File
> /Users/zeno/code/llvm/clean/clang/test/Sema/init-randomized-struct.c Line 46:
> excess elements in struct initializer
> 2 errors generated.
>
> You can replicate this on other build setups by varying the value of
> -frandomoze-layout-seed. On x86_64 Linux and on Aarch64 OSX this worked for
> me (in seed value of lit test, change `f` to `d`):
> -frandomize-layout-seed=1234567890abcded
>
> Also, I know this was talked about before, and I know a fix is planned, but
> just to add my two cents: yes, it would be great if the `std::shuffle` could
> be changed to `llvm::shuffle`, also because we're expecting to produced the
> same code across different platforms for safety (compliance) reasons.
Oh! Good catch. Yeah, it's getting a bit messed up when the field that's
initialized by a designated initializer is moved to the bottom of the
`RecordDecl`. It looks like I can move it above the `Field == FieldEnd` check
and it works (and bonus, I think it's the correct fix).
Thanks!
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D123763/new/
https://reviews.llvm.org/D123763
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